1) R. G. Pearson, J. Am. Chem. Soc., 85, 3533 (1963);
R. G. Pearson, J. Chem. Educ., 45, 581 (1968);
R. G. Pearson, J. Chem. Educ., 45, 643 (1968).
2) Yu. E. Nikitin, Yu. I. Murinov, and A. M. Rosen, Russ. Chem. Rev., 45, 1155 (1976).
3) V. A. Mikhailov, V. G. Torgov, E. M. Gil’bert, L. N. Mazolov, and A. V. Nikolaev, “Proceedings of International Solvent Extraction Conference 1971,” Soc. Chem. Ind., London (1971), p. 1112.